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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '367ca6f2d854259dbbda646d1510464b18598815271f83135be8105be23b7414' 
  AND token = 'w8IL976naTle28DNJY1EQyiO7JQG/zUfDSdmqwfAhwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}